Fuse panel



July 19, 1938. A. B. RYPINSKI 2,124,683

I FUSE PANEL Filed July 22, 19s? mm ALQEIPfRMl/VJK/ ATTORNEY PatentedJuly 19, 1938 PATENT OFFICE FUSE PANEL Albert B. Rypinski, Laurelton, N.Y., assignor to Metropolitan Device tion of New York Corporation, acorpora- Application July 22, 1931, Serial No. 155,044

3 Claims.

The invention herein disclosed relates to a fuse panel and moreparticularly to a fuse panel for plug fuses of the type that are screwedinto a shell.

Heretofore, it has been the practice to construct fuse panels of thistype by providing recesses in one surface of a block of insulatingmaterial, usually porcelain, in which threaded fuse shells are received.The buses through which current flows to the fuses are mounted on theopposite side of the porcelain block. A screw, located at the center ofeach fuse shell passes through the porcelain block and into the bus onthe underside of the block. This screw constitutes the connector betweenthe bus and one side of the plug fuse. The fuse shell constitutes theconnection to the other side of the plug fuse and it is connected to aconductor strip to which a wire may be connected. I

An object of this invention is to simplify the construction of such fusepanels and to eliminate the hazards of short circuits and grounds thatare present when the buses are mounted on the under side of theporcelain block.

In accordance with this invention, the buses are mounted on theporcelain block and positioned to pass through the threaded fuse shellfrom which they are electrically insulated. A rivet passes through thebus, an enlarged opening in the fuse shell and the procelain block. Thehead of the rivet forms a contact for the end contact of the fuse.

Such a fuse panel is illustrated in the accompanying drawing in which;

Fig. l is a plan view of a fuse panel, and

Fig. 2 is a transverse section taken on the line 2-4 of Fig. 1.

The fuse panel shown in the drawing comprises a porcelain block I moldedto the form shown. This particular fuse panel is especially adapted foreight circuits from a three wire single phase' supply. In an oblongcentral section la that is thicker than the rest of the block there areformed two series of recesses 2 and 2a each series containing fourrecesses. In each recess there is mounted a plug-fuse shell 3.

Each fuse shell is cup-shaped and pressed to form threads 3a in thewalls thereof. Slots 3b are cut in the wall of the fuse shell atdiametrically opposite points and when the fuse shells are mounted inthe recess in the block, the slots 3b of the several fuse shells of aseries are in alignment. Each fuse shell rests upon the base of therecess in which it is mounted.

A terminal strip conductor 4 is electrically connected to each fuseshell. This conductor extends across the base of the shell and it isprovided at one end with a lateral extension 4a that extends through thebase of the shell and into a recess provided therefor in the porcelainblock. 5 The fuse shells are thus positioned in the recess with theslots 3?) in alignment. The opposite end of the terminal strip extendsthrough a slot formed in the shell, the strip extending at right anglesto the line of the slots 31), and through a slot in the porcelain block.On the exposed end of the terminal strip there is a terminal screw 5.Between each terminal strip there is a barrier ib formed on theporcelain block. On the upper side of the terminal strip, there is adisk 6 of insulating material.

For each series of fuse shells there is a bus la. and 1b. The busesextend longitudinally of the fuse panel. The bus la extends through theporcelain block and through the aligned slots 3b in the several fuseshells of one series of fuse shells and the bus lb also extends throughthe porcelain block and through the aligned slots in the other series offuse shells. The disks 8 serve to electrically insulate the buses fromthe terminal strip 4 and the bottom of the fuse shells, the opening 32;through the wall of the fuse shells being of sufiicient size to preventcontact with the fuse shell. A series of rivets 8, one for each fuseshell secures the several elements together and to the porcelain block.Each rivet passes through a bus, the insulating disk, enlarged openingsin the base of the shell and the terminal strip, and through theporcelain clock.

It will be seen from theforegoing description of the embodiment of theinvention illustrated in the drawing that there is provided a fuse panelfor plug fuses in which the buses are mounted on the upper side of theporcelain block. These fuse panels are commonly mounted in metal boxesand the fact that the buses are on the upper or outer surface of thepanel and extend through the porcelain block avoids the hazards ofgrounds and short circuits that attend fuse panels as they haveheretofore been constructed. The finished fuse panel is also a morerigid and simple construction than those heretofore made.

It will be obvious that various changes may be made by thoseskilled inthe art in the details of the embodiment of the invention illustrated inthe drawing and described above within the principles and scope of theinvention as expressed in the appended claims.

I claim:

1. In a fuse panel of the type described, the 55 Ill combinationcomprising a block of insulating material, a threaded fuse shell mountedon the block of insulating material, a bus extending through the fuseshell and electrically insulated therefrom, a connector bus connected tothe fuse shell, and a rivet securing the bus, fuse shell and connectorbus to the block of insulating material.

2. In a fuse panel of the type described, the combination comprising ablock of insulating material, a series of aligned fuse shells mounted onthe block of insulating material, a bus extending through the severalfuse shellsand electrically insulated therefrom, a connector bus foreach fuse shell and a rivet extending through each fuse shell, the bus,the corresponding connector bus and the insulating block.

ALBERT B. RYPINSKI.

